Apple today seeded build 12D54 of OS X Mountain Lion 10.8.3 to developers, marking the sixth beta iteration of the newest version of Mountain Lion. 10.8.3 was first seeded to developers in November.

Build 12D54 comes just eight days after build 12D50, and like the previous build, contains no known issues or features. Build 12D50 brought only minor changes, and asked developers to focus on testing AirPlay, AirPort, Game Center, Graphics Drivers, and Safari.

9to5Mac notes that the new build contains significant changes to WiFi, but additional changes are unknown. Registered developers can download the update on Apple's Developer Page.

This post originally referred to Build 12D54 as the seventh developer seed of OS X 10.8.3 when it was actually the sixth seed.

Hi, vmachiel. Could you (or anyone else reading this) please explain what happens during those crashes when switching graphics cards? I mean, what do you see on your computer screen when such a crash happens? Is there any kind of message that appears on the screen?

Hi, vmachiel. Could you (or anyone else reading this) please explain what happens during those crashes when switching graphics cards? I mean, what do you see on your computer screen when such a crash happens? Is there any kind of message that appears on the screen?

Hi there,

I use istat menus, and what i see when the graphic cards switch is one thread of one processor core gets fully used up for about 15 seconds and then the whole systems freezes. It mostly happens when I try to scroll through a web page really fast, or when I open a folder with 50+ files in it that the system tries to preview.

When I reboot and look in console, it always has the same lines in it regarding nvidea and opengl. When I turn off auto switching of graphic cards in system preferences, I don't have any crashes. When it is on, my system crashes every week or so.

Hi, vmachiel. Could you (or anyone else reading this) please explain what happens during those crashes when switching graphics cards? I mean, what do you see on your computer screen when such a crash happens? Is there any kind of message that appears on the screen?

I've seen no changelog (anywhere) that mentions those being addressed.

Try to go into Disk Utility and Repair/Verify Permissions on the HDD. As for the battery, try to calibrate it if you haven't done so recently. Use it from 100% then drain it completely to 0% and then charge it back up to 100%.

The only thing that still bugs me is the occational blue-colour-tint when switching graphics cards (on my almost brand new non-retina but hires 15" MacBook Pro). Hopefully, this will be fixed with a new set of updated graphics-drivers.

__________________A computer is like a bicycle for the mind.
— Steve Jobs

I've seen no changelog (anywhere) that mentions those being addressed.

1) I was experiencing the slow shutdown on my MBP. Searched everywhere for a solution. After booting in verbose mode, I saw a process was hanging. Followed instructions here (3 terminal commands) and now have two second shutdowns.
http://forums.macrumors.com/showthread.php?t=1448304&page=5